build(example): made protoc useless to build grpc client & server

- store the generated content

examples/grpc/build.rs

@@ -1,10 +1,20 @@
-use std::{env, path::PathBuf};
+use std::path::PathBuf;
 
 fn main() {
-    let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
+    // trigger rebuild if "proto" folder change
+    print!("cargo:rerun-if-changed=./proto");
+
+    //let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
+    let out_dir = PathBuf::from(std::env!("CARGO_MANIFEST_DIR"))
+        .join("src")
+        .join("generated");
+    std::fs::create_dir_all(&out_dir).unwrap();
 
     tonic_build::configure()
+        .build_client(true)
+        .build_server(true)
         .file_descriptor_set_path(out_dir.join("helloworld_descriptor.bin"))
+        .out_dir(out_dir)
         .compile(&["helloworld.proto"], &["proto"])
         .unwrap();
 }

examples/grpc/src/client.rs

@@ -1,12 +1,13 @@
-use hello_world::greeter_client::GreeterClient;
-use hello_world::{HelloRequest, StatusRequest};
+use generated::greeter_client::GreeterClient;
+use generated::{HelloRequest, StatusRequest};
 use tonic::transport::Channel;
 use tonic::Code;
 use tonic_tracing_opentelemetry::middleware::client::OtelGrpcLayer;
 use tower::ServiceBuilder;
 
-pub mod hello_world {
-    tonic::include_proto!("helloworld");
+pub mod generated {
+    //tonic::include_proto!("helloworld");
+    include!("generated/helloworld.rs");
 }
 
 #[tokio::main]